<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="collapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域-->
        <el-menu
          background-color="#373d41"
          text-color="#fff"
          active-text-color="#409BFF"
          unique-opened
          :collapse="collapse" :collapse-transition="false"
          router
          :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="(item, index) in menuList">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="'iconfont ' + icon[item.id]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/' + it.path" v-for="(it, key) in item.children" @click="saveNavState('/' + it.path)">
              <!--图标-->
              <i class="el-icon-menu"></i>
              <!--文本-->
              <span>{{ it.authName }}</span>
            </el-menu-item>
          </el-submenu>

        </el-menu>
      </el-aside>
      <!--右侧主体内容-->
      <el-container>
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      menuList : [],
      icon : {
        '125' : 'icon-user',
        '103' : 'icon-tijikongjian',
        '101' : 'icon-shangpin',
        '102' : 'icon-danju',
        '145' : 'icon-baobiao'
      },
      collapse : false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods:{
    logout () {
      // 清除token
      window.sessionStorage.removeItem('token');
      // 跳转至登录页
      this.$router.push('/login');
    },
    // 获取所有的菜单
    async getMenuList(){
      let {data: res} = await this.$http.get('menus');
      if ( res.meta.status !== 200 ) this.$message.error(res.meta.msg);
      this.menuList = res.data;
    },
    // 点击按钮,切换菜单展开
    toggleCollapse(){
      this.collapse = !this.collapse
    },
    // 保存菜单的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  }
}
</script>

<style lang="less" scoped>
.home-container{
  height: 100%;
}

.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: white;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside{
  background-color: #333744;
}

.el-main{
  background-color: #eaedf1;
}

.iconfont{
  margin-right: 10px;
}

.el-menu{
  border-right: none;
}

.toggle-button{
  background: #4a5064;
  color: white;
  text-align: center;
  line-height: 24px;
  font-size: 10px;
  letter-spacing: 0.2em;
}
</style>
